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<p>So is there still no way to reprogram the FM100 without a MATE
3? I just sold off my spare MATE3. Always thought it was lame
you needed such an expensive interface just to make adjustments.
Resetting to factory programming used to be a pain, but now with
LiPO4 batteries it can be a downright fire hazard. </p>
<p>Ray Walters<br>
Remote Solar</p>
<div class="moz-cite-prefix">On 4/11/2026 10:14 AM, Tyrone Houck via
RE-wrenches wrote:<br>
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cite="mid:CAEqH54ms1xNqhBgiVrXFy_d+Gy-s85JuyDX3mdvq3kovFFvvfw@mail.gmail.com">
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<div>Thank you! This likely just saved one of my customers(at
least!) the cost of a new fm100!</div>
<div dir="auto"><br>
</div>
<div>Tyrone Houck<br>
Oregon Solarworks LLC<br>
CCB #204937 LRT #076<br>
541-787-1366<br>
<a href="mailto:tyrone@oregonsolarworks.com"
moz-do-not-send="true" class="moz-txt-link-freetext">tyrone@oregonsolarworks.com</a></div>
<div data-smartmail="gmail_signature"><br>
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<div class="gmail_quote gmail_quote_container">
<div dir="ltr" class="gmail_attr">On Sat, Apr 11, 2026, 8:51 AM
Richard Nicol via RE-wrenches <<a
href="mailto:re-wrenches@lists.re-wrenches.org"
moz-do-not-send="true" class="moz-txt-link-freetext">re-wrenches@lists.re-wrenches.org</a>>
wrote:<br>
</div>
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style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto">Reviving an older topic with a new learning
regarding FM100 resetting to defaults after a shutdown
event.
<div>Memory is battery dependent rather than solid state.<br>
<div>There is a button cell battery (2032), on the circuit
board attached to the lid, with the leds on it. Three
phillips screws hold it in place. </div>
<div>Apparently Outback knows they have had batches of
these batteries.</div>
<div><img alt="image0.jpeg"
src="cid:mf_BFB90FF6-D60A-4F99-8B3E-C685250F037E/L0/001"
moz-do-not-send="true"><img alt="image1.jpeg"
src="cid:mf_1B5E3F6A-C795-4C7A-B69C-82356B66BC8A/L0/001"
moz-do-not-send="true"><br
id="m_1347035293935222836lineBreakAtBeginningOfSignature">
<div dir="ltr">Sent from my iPhone</div>
<div dir="ltr"><br>
<blockquote type="cite">On Jan 10, 2026, at 2:18 PM,
Nick Lucchese via RE-wrenches <<a
href="mailto:re-wrenches@lists.re-wrenches.org"
target="_blank" rel="noreferrer"
moz-do-not-send="true"
class="moz-txt-link-freetext">re-wrenches@lists.re-wrenches.org</a>>
wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">Yes, it keeps happening to me as
well. At least 8 times now. The first couple times
I blamed myself and thought I had made the rookie
default settings mistake I see on other's
sites but now I know better. Only the FM100. Just
got back from a site that resulted in the client's
Radian shutting down due to battery volt sense
faults from it. First time it has caused shutdowns
though. Looks like her Blue Ions had been sitting
at 57.6 for months now. Unfortunately she
has Hughesnet that almost never works with
Opticsre otherwise I would have caught it.
Extremely frustrating, I've easily eaten enough
service calls and equipment failures for Outback
over the years that I could have paid off a Toyota
Yaris. No exaggeration.<br>
<div><br>
</div>
<div>Nick</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Jan 9,
2026 at 2:58 PM Zeke Yewdall via RE-wrenches
<<a
href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank"
rel="noreferrer" moz-do-not-send="true"
class="moz-txt-link-freetext">re-wrenches@lists.re-wrenches.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div>Has anyone else had issues with outback
charge controllers resetting to default
settings? I just had a FM100 do this (and
shut the whole system down because the
default settings were too high of voltage
for a 15 cell LFP, so the battery turned
itself off for protection). The logs show
that the values were set to 0 from the
proper settings, then to the default
settings from 0, on site. But no one was on
site. I changed them back remotely via
opticsRE, and it logged me as changing them
back, as it should have.</div>
<div><br>
</div>
<div>Occasionally in the past I've had similar
things happen, and always kind of chalked it
up to the customer perhaps messing with the
system, but this time I know that no one was
there to adjust it locally at the time that
it says it was changed.</div>
<div><br>
</div>
<div>I have another site this week that does
not have opticsRE, that the FM100 may have
reset to default settings as well. Same
thing -- lithium batteries shutting off from
overvoltage all of a sudden. I am still
investigating that one.</div>
<div><br>
</div>
<div>Zeke</div>
<br>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">Zeke Yewdall
<div>PV Engineer</div>
<div>NABCEP #031508-89</div>
<div><a
href="mailto:zeke@darkforestsolar.com" target="_blank" rel="noreferrer"
moz-do-not-send="true"
class="moz-txt-link-freetext">zeke@darkforestsolar.com</a></div>
<div>303-523-3592</div>
</div>
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